This visualization displays Gapminder country data—including income per capita, total population, life expectancy, and fertility rate—as colored circles plotted over a world map background. A dropdown menu allows switching the y-axis attribute, while circles are color-coded by World Bank global region. The map is rendered using `d3.geoNaturalEarth1` and `d3.geoPath` with TopoJSON world atlas data, while React manages component state and D3 scales handle axes and color encoding.